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What does 'super' do in Python?
...y you add another class to your object, and want to inject a class between Foo and Bar (for testing or some other reason):
class InjectMe(SomeBaseClass):
def __init__(self):
print('InjectMe.__init__(self) called')
super(InjectMe, self).__init__()
class UnsuperInjector(UnsuperCh...
In Java, what is the best way to determine the size of an object?
...and Serviceability Agent (SA) heavily to decoder the actual object layout, footprint, and references. This makes JOL much more accurate than other tools relying on heap dumps, specification assumptions, etc.
To get the sizes of primitives, references and array elements, use VMSupport.vmDetails(). ...
Do asynchronous operations in ASP.NET MVC use a thread from ThreadPool on .NET 4
...m you use worker threads. Well actually EF is lazy so when you do _context.Foo you are actually not executing anything. You are just building an expression tree. Be extremely careful with this. The query execution is deferred only when you start enumerating over the resultset. And if this happens in...
Hidden Features of MySQL
...ds of counters created lazily:
insert into occurances(word,count) values('foo',1),('bar',1)
on duplicate key cnt=cnt+1
You can insert many rows in one query, and immediately handle duplicate index for each of the rows.
...
What happens when a computer program runs?
...
Write a simple program like this, and then compile it to assembly (gcc -S foo.c if you have access to GCC), and take a look. The assembly is pretty easy to follow. You can see that the stack is used for function local variables, and for calling functions, storing their arguments and return values...
What are the calling conventions for UNIX & Linux system calls (and user-space functions) on i386 an
...
*
* Only called from user space.
*
* When user can change pt_regs->foo always force IRET. That is because
* it deals with uncanonical addresses better. SYSRET has trouble
* with them due to bugs in both AMD and Intel CPUs.
*/
and for 32-bit at arch/x86/entry/entry_32.S:
/*
* 32-bit SY...
What is an existential type?
...
// T is universal from out here
MyClass<String> mc1 = new MyClass("foo");
MyClass<Integer> mc2 = new MyClass(123);
MyClass<?> mc3 = MyClass.secretMessage();
From the perspective of a client of MyClass, T is universal because you can substitute any type for T when you use that ...
Why would you use an ivar?
...
Can't you access a private ivar with object->foo? Not that hard to remember.
– Nick Lockwood
Feb 6 '12 at 10:52
...
Why does this loop produce “warning: iteration 3u invokes undefined behavior” and output more than 4
...Linux kernel null pointer check removal where in seeing this code:
struct foo *s = ...;
int x = s->f;
if (!s) return ERROR;
gcc inferred that since s was deferenced in s->f; and since dereferencing a null pointer is undefined behavior then s must not be null and therefore optimizes away th...
What and where are the stack and heap?
...d to allocate a lot of data.
Responsible for memory leaks.
Example:
int foo()
{
char *pBuffer; //<--nothing allocated yet (excluding the pointer itself, which is allocated here on the stack).
bool b = true; // Allocated on the stack.
if(b)
{
//Create 500 bytes on the stack
char...